[lrem]

For everyone's convenience: Introduced: 1959

[Gravityloss]

I just recently learned that even though the MiG-21 models outwardly look quite similar, the plane was redesigned many times over during its long life span, numerous versions and massive build quantity.

[Jtsummers]

And Romania got them starting in 1962.

[mytailorisrich]

And made famous during the Vietnam War.